Osse (river)

The Osse is a 120 km long river in southwestern France, right tributary of the river Gélise. Its source is in the Hautes-Pyrénées, 2 km southeast of the village Bernadets-Debat, in the Plateau de Lannemezan. It joins the river Gélise 5 km southwest of the town Nérac.

Its course crosses the following départements and communes:


 * Hautes-Pyrénées: Bernadets-Debat
 * Gers: Montesquiou, Saint-Arailles, Vic-Fezensac, Mouchan
 * Lot-et-Garonne: Fréchou, Moncrabeau, Lannes